{"product_id":"1-4-npt-port-cabin-air-height-leveling-control-valve-kit-fit-hadley-mack-volvo","title":"1\/4\" NPT Port Cabin Air Height Leveling Control Valve Kit Fit Hadley Mack Volvo","description":"\u003ch2\u003eCabin Air Height Leveling Control Valve Kit for Hadley, Mack, and Volvo\u003c\/h2\u003e\u003cp\u003eCabin air height leveling control valve kit with a 1\/4\" NPT port regulates suspension air pressure to maintain a consistent ride height on heavy-duty trucks.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe cabin air height leveling control valve kit for Hadley, Mack, and Volvo trucks maintains level air suspension regardless of load. This mechanical valve with a 1\/4\" NPT port automatically adjusts air pressure to the cabin, preventing sag and boosting stability. Built for class 8 trucks, the height leveling control valve kit ensures a smooth and safe ride.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1\/4\" NPT inlet\/outlet port for standard air line fittings.\u003c\/li\u003e\n\u003cli\u003eAll-metal brass and steel construction withstands harsh under-truck conditions.\u003c\/li\u003e\n\u003cli\u003eAdjustable linkage sets precise ride height for your cabin suspension.\u003c\/li\u003e\n\u003cli\u003eMaintains constant air bag pressure to compensate for varying loads.\u003c\/li\u003e\n\u003cli\u003eDirect bolt-on replacement for original Hadley-style leveling valves on Mack and Volvo trucks.\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant plating extends service life in road salt and moisture.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Hadley height control valve applications\u003c\/li\u003e\n\u003cli\u003efor Mack CH, CX, and CXN series\u003c\/li\u003e\n\u003cli\u003efor Mack Granite and Pinnacle models\u003c\/li\u003e\n\u003cli\u003efor Volvo VNL, VNM, and VNR series\u003c\/li\u003e\n\u003cli\u003efor Volvo VHD and VAH heavy-duty models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eMaintaining cab ride height on long-haul tractors with sleeper cabins.\u003c\/li\u003e\n\u003cli\u003eAdjusting suspension for varying fifth-wheel loads and trailer weight distribution.\u003c\/li\u003e\n\u003cli\u003ePreventing air suspension sag during heavy-duty towing and recovery operations.\u003c\/li\u003e\n\u003cli\u003eEnsuring consistent cabin level for driver comfort and safety on uneven terrain.\u003c\/li\u003e\n\u003cli\u003eReplacing worn-out height control valves in vocational dump and concrete mixers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePort Thread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\/4\" NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eValve Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMechanical height control valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBody Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBrass\/steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHadley-style systems; Mack, Volvo trucks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e How does a height control valve work? \u003cstrong\u003eA:\u003c\/strong\u003e It senses suspension height via a linkage arm and opens or closes to add or exhaust air from the air springs, keeping the truck level.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Will this valve fit my truck with a factory Hadley system? \u003cstrong\u003eA:\u003c\/strong\u003e This kit is designed to directly replace most Hadley-type height control valves on Mack and Volvo trucks; verify valve mounting pattern and linkage orientation for your model.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":44965132173398,"sku":"ZZ3A00624","price":85.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/57_6c9fac11-1dc0-4f9e-8147-48ea9788167b.jpg?v=1781654099","url":"https:\/\/www.solidspare.com\/products\/1-4-npt-port-cabin-air-height-leveling-control-valve-kit-fit-hadley-mack-volvo","provider":"Solid Spare","version":"1.0","type":"link"}